• Lukas Podolski scores twice in Arsenal 4-0's victory over Köln• Andy Carroll scores for Liverpool in win over Bayer LeverkusenRobin van Persie came off the bench but received a muted welcome from the travelling Arsenal fans as the club ended their pre-season preparations with an emphatic 4-0 win at Köln.Thomas Vermaelen opened the scoring before Lukas Podolski scored twice against his former club, the first a penalty, to make it 3-0 at half-time. Gervinho added to the lead before Van Persie took the captain's armband off Vermaelen for the game's final quarter.A goal from the out-of-favour An...